From b06ebb3255268c5a297afbb8598e2cc11fab7944 Mon Sep 17 00:00:00 2001
From: David Nugent <davidn@FreeBSD.org>
Date: Sun, 13 Apr 1997 15:16:03 +0000
Subject: [PATCH] Implement two new keywords and status flags for entries in
 /etc/ttys; TTY_NETWORK (network), TTY_DIALUP (dialup), which determine a
 basic connection type. TTY_DIALUP in particular will replace the old out of
 date heuristic "tty[dD]*" in login.c (and better than the current hard-coded
 method).

---
 lib/libc/gen/getttyent.3 | 29 +++++++++++++++++++++++++-
 lib/libc/gen/getttyent.c | 45 +++++++++++++++++++++++++++++++++++++---
 2 files changed, 70 insertions(+), 4 deletions(-)

diff --git a/lib/libc/gen/getttyent.3 b/lib/libc/gen/getttyent.3
index 06b1e9453c49..51290d9b0bd9 100644
--- a/lib/libc/gen/getttyent.3
+++ b/lib/libc/gen/getttyent.3
@@ -40,6 +40,9 @@
 .Nm setttyent ,
 .Nm endttyent
 .Nd get ttys file entry
+.Nm isdialuptty ,
+.Nm isnetworktty
+.Nd determine tty type from ttys file entry
 .Sh SYNOPSIS
 .Fd #include <ttyent.h>
 .Ft struct ttyent *
@@ -50,6 +53,10 @@
 .Fn setttyent void
 .Ft int
 .Fn endttyent void
+.Ft int
+.Fn isdialuptty "const char *name"
+.Ft int
+.Fn isnetworktty "const char *name"
 .Sh DESCRIPTION
 The
 .Fn getttyent ,
@@ -66,6 +73,8 @@ struct ttyent {
 	char	*ty_type;	/* terminal type for termcap */
 #define	TTY_ON		0x01	/* enable logins (start ty_getty program) */
 #define	TTY_SECURE	0x02	/* allow uid of 0 to login */
+#define	TTY_DIALUP	0x04	/* is a dialup tty */
+#define	TTY_NETWORK	0x08	/* is a network tty */
 	int	ty_status;	/* status flags */
 	char	*ty_window;	/* command to start up window manager */
 	char	*ty_comment;	/* comment field */
@@ -87,7 +96,7 @@ The name of the default terminal type connected to this tty line.
 A mask of bit fields which indicate various actions allowed on this
 tty line.
 The possible flags are as follows:
-.Bl -tag -width TTY_SECURE
+.Bl -tag -width TTY_NETWORK
 .It Dv TTY_ON
 Enables logins (i.e.,
 .Xr init 8
@@ -96,6 +105,16 @@ will start the command referenced by
 on this entry).
 .It Dv TTY_SECURE
 Allow users with a uid of 0 to login on this terminal.
+.It Dv TTY_DIALUP
+Identifies a tty as a dialin line.
+If this flag is set, then
+.Fn isdialuptty
+will return a non-zero value.
+.It Dv TTY_NETWORK
+Identifies a tty used for network connections.
+If this flag is set, then
+.Fn isnetworktty
+will return a non-zero value.
 .El
 .It Fa ty_window
 The command to execute for a window system associated with the line.
@@ -155,6 +174,14 @@ function
 and
 .Fn endttyent
 return 0 on failure and 1 on success.
+.Pp
+The routines
+.Fn isdialuptty
+and
+.Fn isnetworktty
+return non-zero if the dialup or network flag is set for the
+tty entry relating to the tty named by the parameter, and
+zero otherwise.
 .Sh FILES
 .Bl -tag -width /etc/ttys -compact
 .It Pa /etc/ttys
diff --git a/lib/libc/gen/getttyent.c b/lib/libc/gen/getttyent.c
index ca0413cbe4bf..1fb1960546d7 100644
--- a/lib/libc/gen/getttyent.c
+++ b/lib/libc/gen/getttyent.c
@@ -57,6 +57,8 @@ getttynam(tty)
 {
 	register struct ttyent *t;
 
+	if (strnchr(tty, "/dev/", 5) == 0)
+		tty += 5;
 	setttyent();
 	while ( (t = getttyent()) )
 		if (!strcmp(tty, t->ty_name))
@@ -96,6 +98,9 @@ getttyent()
 			break;
 	}
 
+#define	scmp(e)	!strncmp(p, e, sizeof(e) - 1) && isspace(p[sizeof(e) - 1])
+#define	vcmp(e)	!strncmp(p, e, sizeof(e) - 1) && p[sizeof(e) - 1] == '='
+
 	zapchar = 0;
 	tty.ty_name = p;
 	p = skip(p);
@@ -105,15 +110,19 @@ getttyent()
 		p = skip(p);
 		if (!*(tty.ty_type = p))
 			tty.ty_type = NULL;
-		else
+		else {
+			/* compatibility kludge: handle network/dialup specially */
+			if (scmp(_TTYS_DIALUP))
+				tty.ty_status |= TTY_DIALUP;
+			else if (scmp(_TTYS_NETWORK))
+				tty.ty_status |= TTY_NETWORK;
 			p = skip(p);
+		}
 	}
 	tty.ty_status = 0;
 	tty.ty_window = NULL;
 	tty.ty_group  = _TTYS_NOGROUP;
 
-#define	scmp(e)	!strncmp(p, e, sizeof(e) - 1) && isspace(p[sizeof(e) - 1])
-#define	vcmp(e)	!strncmp(p, e, sizeof(e) - 1) && p[sizeof(e) - 1] == '='
 	for (; *p; p = skip(p)) {
 		if (scmp(_TTYS_OFF))
 			tty.ty_status &= ~TTY_ON;
@@ -123,6 +132,10 @@ getttyent()
 			tty.ty_status |= TTY_SECURE;
 		else if (scmp(_TTYS_INSECURE))
 			tty.ty_status &= ~TTY_SECURE;
+		else if (scmp(_TTYS_DIALUP))
+			tty.ty_status |= TTY_DIALUP;
+		else if (scmp(_TTYS_NETWORK))
+			tty.ty_status |= TTY_NETWORK;
 		else if (vcmp(_TTYS_WINDOW))
 			tty.ty_window = value(p);
 		else if (vcmp(_TTYS_GROUP))
@@ -223,3 +236,29 @@ endttyent()
 	}
 	return (1);
 }
+
+static int
+isttystat(tty, flag)
+	const char *tty;
+	int flag;
+{
+	register struct ttyent *t;
+
+	return ((t = getttynam(tty)) == NULL) ? 0 : !!(t->ty_status & flag);
+}
+
+
+int
+isdialuptty(tty)
+	const char *tty;
+{
+
+	return isttystat(tty, TTY_DIALUP);
+}
+
+int isnettty(tty)
+	const char *tty;
+{
+
+	return isttystat(tty, TTY_NETWORK);
+}